I agree with pretty much everything said regarding comics, I tend to always collect in TPB's myself though as I'm tight and can't justify the single issue costs.

TPB's also tend to look very good on your sehelf.
check out TF wiki for issu listings etc.

Larger comic shops have a fair bit of TPB stock at the moment too due to the third movie coming out last year, they all stocked up good for catching up.